Generalises raster lookups so they can be used for any raster source not just SRTM
Adds support for downloading from FTP sources, which I hadn't realised wasn't supported by requests
Adds support for raster sources not in EPSG:4326.
Much clearer documentation of how to add data sources.
Note that the code in its current state uses some srtm options that are not documented in the README. This is because I'm going to pull them out and treat SRTM as a universal fallback with nothing specified in datasources.json for it. I just haven't had time to finish that work today.
This is a small increment:
requestsNote that the code in its current state uses some
srtmoptions that are not documented in the README. This is because I'm going to pull them out and treat SRTM as a universal fallback with nothing specified indatasources.jsonfor it. I just haven't had time to finish that work today.